Verizon is making progress updating the drivers and VZAccess Manager software so that it is compatible with Windows Vista. Take a look at http://www.vzam.net, their official download site. For those of you using the PC 5740 card like I am, you can download the current version of VZAccess Manager directly from http://www.vzam.net/uploadedFiles/VZAccess_6.2.4_1641c-5740.exe. Keep in mind that this version and link are subject to change so it's probably best to start at the main website.
The software installed cleanly and so far I have not been able to reproduce the Blue Screen Of Death (BSOD) that was present in previous versions. The repro I am talking about is a normal scenario. Many times I forget I'm connected to the EVDO network via VZAccess Manager 5.x. I'd hit my power button to shut down and BOOM, BSOD. Nice.
Like I said, so far, so good. I'm posting this via the wonders of the cell network. Love it.